I'm calibrating my new printer, Geeetech A20M at the moment. It's printing fine so far, but seems the step/mm values are a bit off, because the dimensions of printed parts are a bit off. So guess I need to start to calibrate the E-steps first. It's a printer with a bowden tube. And I've tried to calculate the E-step vallues in 2 ways now. With and without the tube.

- I get around 430 steps/mm as a value when keeping the bowden tube connected and feed 100mm through the heated hotend.
- I get around 400 steps/mm when removing the tube at the exit of the extruder and feed 100mm directly cold through it.

It's verry logical that it gets more presure when trying to push 1,75mm to a heated 0,4mm nozzle And so the extruder needs to work harder.But I believe there should be no diffrence in values by using the tube or not? Right?